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- W1978696579 abstract "view Abstract Citations (26) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Finding Protoquasars at High Redshifts Loeb, Abraham Abstract Phenomenological and theoretical arguments suggest that the progenitors of quasars form at high redshifts (z ~> 10). Searches for protoquasars may best be undertaken in the infrared or millimeter regimes; optical surveys are limited by intrinsic dust extinction or intergalactic absorption. Under plausible conditions, the emission of fine-structure lines from the host systems of quasars can be detected by millimeter telescopes. For example, the [C II] 158 micron line flux from a bulge surrounding a bright quasar at a redshift of 10 can reach a value ~2 microJy. This signal will be detectable at the 3 σ level with a 1 beam and a velocity resolution of 150 km s^-1^ after 40 minutes of observation by the future Millimeter Array telescope. Before the central activity turns on, the emission would be weaker. Still, if protoquasars are star-forming bulges with a comoving number density of present-day galaxies, it will be possible to discover them in millimeter searches beyond the redshift limit of current quasar surveys. Detection of host systems with spatial and velocity resolutions would provide information about the origin of quasars. Publication: The Astrophysical Journal Pub Date: February 1993 DOI: 10.1086/186738 Bibcode: 1993ApJ...404L..37L Keywords: Active Galaxies; Cosmology; Galactic Evolution; Quasars; Red Shift; Black Holes (Astronomy); Line Spectra; Lyman Alpha Radiation; Millimeter Waves; Astrophysics; BLACK HOLE PHYSICS; COSMOLOGY: THEORY; GALAXIES: ACTIVE; GALAXIES: FORMATION full text sources ADS |" @default.
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- W1978696579 date "1993-02-01" @default.
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- W1978696579 title "Finding protoquasars at high redshifts" @default.
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